"The expendable pattern casting (EPC) process has been studied from several directions in order to optimize processing parameters and casting quality. A brief review is presented in Paper 1. Paper 2 describes the effect of vent-holes inside the pattern on mold filling and casting quality in the EPC process. It is found that under the same casting conditions, faster mold filling speed and fewer surface defects occurred in castings made from patterns with vent-holes for iron castings, while very little difference was found for aluminum castings poured below about 730C (1346F). Paper 3 includes an investigation of mold filling in thin section castings produced by the process. The fluidity in aluminum alloys was found to depend on a complex relationship between pouring temperature and the mechanism by which the decomposition products from the foam pattern were removed through the refractory coating. In gray iron, fluidity depends on the more rapid decomposition of the foam and rapid transport of gaseous decomposition products through the coating. High permeability coatings and increased metallostatic pressure improve the fluidity of both aluminum and iron castings. Paper 4 is related to the transport of decomposition products in the unbonded sand. These transformations suggest that transfer of heat into and through the unbonded sand is dependent on both heat and mass transfer. All the experiments were conducted for both aluminum and gray iron"--Abstract, page iv.
Askeland, Donald R.
Kohser, Ronald A.
Ramsay, Christopher W.
Watson, John L.
Materials Science and Engineering
Ph. D. in Metallurgical Engineering
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- A review of the expendable pattern casting (EPC) process
- Effect of vent-holes in patterns on filling process and casting quality using the evaporative pattern process
- Mold filling in thin section castings produced by the expendable pattern casting process
- Transport of foam decomposition products into the sand in the EPC process
xvi, 151 pages
© 1992 Jiang Fu, All rights reserved.
Dissertation - Restricted Access
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Electronic access to the full-text of this document is restricted to Missouri S&T users. Otherwise, request this publication directly from Missouri S&T Library or contact your local library.http://merlin.lib.umsystem.edu/record=b2395389~S5
Fu, Jiang, "An optimization of processing parameters and casting quality in the expendable pattern casting (EPC) process" (1992). Doctoral Dissertations. 840.
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